class_docstr: Helper to grab a series of screenshots from the current Canvas-like object.
code: def save_frame(self, filename, frame_index=0):
      imsave(filename, self._collected_images[frame_index])
  
imports: from __future__ import annotations
  import os
  import time
  import shutil
  from vispy.io import imsave
  from vispy.gloo.util import _screenshot
  from vispy.scene import SceneCanvas
  from sphinx_gallery.scrapers import optipng, figure_rst
label_desc: Use image node_id 11 for calling the FrameGrabber obj's underlying member method code with example usage: obj.save_frame(filename, frame_index) without return types